Electrical heater.



A." G. HULBERT.

ELEGTRICAL HEATER.

APPLICATION FILED APR. 22, 1912.

1,064,330, Patented June 10, 1913.

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BYAWOBE W HIS ATTdHNEY ANSEL C. HULBEB'I, OF SAN FRANCISCO, CALIFORNIA.

ELECTRICAL HEATER.

Specification of Letters Patent.

Patented June 10, 1913.

Application filed April 22, 1912. Serial No. 692,404.

To all whom it may concern:

Be it known that I, ANsnL G. HnLnnn'r, a citizen of the United States, residing at San Franciscmin the county of San Francisco and State of California, have invented a new and useful Electrical Heater, of which the following is a specification in such full and, clear terms as will enable those skilled in the art to construct and use the same.

This invention relates to an electrical heater and its ob'ect is to provide a heater which will give t e maximum heating area for the wire used.

Another object of the invention. is. to provide a heater of such shape as to enable it to be used for heating and cooking purposes in a vessel in such a way as to permit the essel to be used for the ordinary cooking operations.

n will be understood an with the ordi nary electrical immersion heaters, their duce form of electric heater which will be very easily wound and which will have its resistance wire suitably insulated, while, at th sometime, bringing said Wires out of the core upon which they are wound at the most convenient place for the connection thereof with the feed wires.

Another object of the invention is to promeans whereby the heater cannot be removed from the vessel in which it is ordinarily used without disconnecting the electric circuits, thus insuring the protection of the heater from accidental use when not inimersed in water. It will be understood by those skilled in the art that in the case of immersion heatersthat they are made to give the best heating'efi'ect when immersed in the fluid to be heated. This necessuril y produces a heater which is not intended to be used unless so immersed, and therefore this safety device is applied thereto in order to avoid the accidental heating of the device unless properly immersed.

Another object of the invention is to so wind the core that the resistance wire will be in contact therewith throughout its entire length, thus preventing the wire from being overheated by any current with which it is liable to be connected.

In the drawings in which the same numeral of reference is appliedto the some portion throughout the several views, Figure 1 is a vertical sectional view through the heater and the dipper used in connection therewith for heating water or for other cooking purposes, Fig. 2 is a plan view of the dipper with a portion of the cover thereof broken away, Fig. 3 is a side elevation of the cage used for boiling eggs, etcj, Fig. 4 is a side elevation of the electric heater removed from the receptacle with which it is ordinarily used, Fig. 5 is a plan view of the heating element, portions thereof being broken away for purposes of illustration, Figs. 6 and 7 are sectional views of the heat.- ing element illustrating the formation of the double seam used in connection there with, and Fig. 8 is an enlarged sectional view of the end. of the heater handle showing the catch used to lock the heater and dipper together when the plug containing the feed wires is pushed into the heater handle.

The numeral 1 represents a dipper having a suitable handle 2, a brace 3 being used to strengthen the handle at the point of connection with the dipper. The dipper is provided with a cover 4; having a suitable flange 5, which flange is provided with a notch to pass over the heater handle 6. The heater handle fits the top of the dipper handle and has a portion 7 extending down into the dipper at the side thereof, the heater proper being shown at 10 and secured to the lower end of the tube 7. k

Where it is desired to boil such articles as eggs or potatoes, the cage 11 may be used, said cage having depending lugs 12 to prevent it from being displaced from the heater 10 when lifted out of the dipper 1 by means of the heater. The electric wires 13 and 14 are connected with the terminals 15 and 16 I near the end of the heater handle and a plug 17 is used to connectsaid terminals with the source of electric current supply, a cable 18 being connected with said plug 17 Slidable on the end of the handle 6 below the terminals 15 and 16 is a catch 19 which is pushed forward by the insertion of the plug 17 inits place and which looks the handle and the handle 6 together as indi- --a compound of asbestos holes adjacent separated by the the poss bility ojt' striated at his top is tien the flan e ZB whereupon said things is then (rated. at 20. The rivet 19 holds the catch in place vand a spring 20 pushes it back when the plug is removed from the handle. It is thus impossible to remove the heater the plug .17 from the handle, whereupon the electric circuit Will be broken and no possible danger of overheating the heating element 10 will occur.

The heating element comprises a core of non-conducting heat resistant material 21, fiber being most suitable for this purpose. This core is a flat annulus having a saw-cut 22 therein. to provide an air gap between the two ends of the lead wires 13 and 14 The annulus 2]. has a series of notches cut in its inner and outer edges and the ljesistance'wire 23 is wound around the same to lie radially as indicated in the sectional plan View. of the heater. The two ends of the resistance wire 28 are passed through holes in the annulus 23. adjacent the sew-cut therein While the feed Wires 13 and 14- are passed through small said saw-cut, as near the outer edge as possible after which the re" sistance wire i 'swound about the feed wires below the annulns,, thus preventing it from being pulled out of sold, annulus and thus disconnecting the feed Wires and resistance Wire. This form of core for the resistance Wire presents the maximum arse of heating surface for material used, both as to the Yir and the. annulus since it is wound on both sides ofthe annulus and both sides thereof give over heat tothe liquid in wl ch the heater is immersed. 'A further Wm 11 tags of this type ofcore lies in the fact the lead wires touch the an 'iuitus at two 3 gap 22; thus prevent a short circu the resistance, wireis Wound k eroi. id the annulus it may he eesily connected with the lead wires on opposite sides the as near the outer edge as "possible.

It will heclscrwed that the resistance Wire lies in note -es cut-in the inner -r edges of the annulus 21' .1 h her of mains to l u insulation heis shown in sect hen,

\ The ennulns the mice. disks sjfitei. having the wires properly -}f. l Z -I,C e placed within at shallow metallic cup his cup is flanged shown h t 28 at 1 her and outer edges and the top 29 is plsccd thereon. flanged downwardly around double in shown tut 30 to double seamed water tight gognt with tl'ie'shnllow cup wlgichthc annulus 21 an; i lgcica, disks replace. The top is flanged upwardly I i from the dipper withoutfirst with-drawing I i I heating element m y b secure the adjacent one edge and the interior of said in which the feed wires are placed.

In use the heater is placed in the dipper and Water or other liquid to be heated is placed therein. The plug 17 may then be inserted in the handle of the heater, which act will automatically lock the heater handle to the dipper handle, whereupon the current may be turned 011 and the material in the dipper will be heated for-any length of time it may be desired.

When it is desired to boil eggs or other materials of this kind, they maybe placed in the cage used for that purpose and may be either lifted out with the cage or may be lifted out by lifting the heater and cage to-' gether, the lugs on the cage preventmg it from slipping oh" the heater l n advantage ofthis heater lies in the factthat the heating 'Wire is covered and does not come in contact with the liquid to be heated, avoiding any dissociation of the liquid heated.

Having thus described my invention what l claim as new and desire to secure by Lcttors Patent of t e United lows: v

1. In an electric heater, a flat annular case, an electric heating element in said case a handle secured to one edge of the case and through which the lead wires to the heatin clement pass, receptacle within which the placed, a handle for said receptacle and along which the heater handle ex cls, and means carried by the handle it heater to secure the same to the handle oY the receptacle, as described.

An electric heater comprising an snow in motel cese,an electric heating element in said csse, a hollow handle at the edge of the case and through which electric feed wires pass, a receptacle for we heater, handle for the receptacle ocd tofit the heater handle and means to heater handle to the receptacle handle, as described,

3. In an electric heater; a. flat heating eleme t, a handle therefor at the outer edge cot, o, handled receptacle in which heatelement is adapted to he placed, a ocket carrying electric feed wires and adap edto he inserted within the heater handle, and a slidahle catch open the socket to secure the heater and rec together, as described 4%. In an electric heater, a flat heating ielement, a handle therefor at one edge thereof; electric feed wires passing through said handle, a handled receptacle within which the heater is adapted to be placed, means to secure the handle of the heater and-the handle of the receptacle to other, end a cage adapted to he placed wi 'n the receptacle upon the heating element, said, cage States is as fol-t ehman having lugs toucoact with thc heatingelv, mnt to pre'vcnt it being flicplaccdtherefrom, as described. T v

5. In an electric beaten" c fish's annulus having an electric heating clcmcnt therein, a handle at the edge thcreof, QlQClJiLlC feed wires passing thcrethi'ough, a reccptacle within which the, heaterds adapecd 120 be placed, a. handle for said rcccptaclc, a, plug carrying electric feed wires and adapfecl tc. be inserted in the and of the heater hamllc, and a spring'lock operated by the plug to lcck the heater handle and the receptacle hamllc 'iogethcr when the plug is inserted v in the heatgr. handle asi clescribed.

In testimony wherccf I have hereunto set my hand this 13th (lay of April D. I912, in the prcsencco'f the two subscribed Wi;t--

BBS-SES- ANSELU. HULBERT.

Witlncssesaa I Q Q. P. Gmm m,

'[ L. H. ANDERSON. 

